chore: update `dummy_c` to use the latest c++ plugin SDK version

[Andreagit97]

What type of PR is this?

/kind failing-test

Any specific area of the project related to this PR?

/area plugins

What this PR does / why we need it:

Currently, dev plugins are not released when a PR is merged in master. This is the error

Mon Oct 30 14:06:43 2023: Falco version: 0.35.1 (x86_64)
Mon Oct 30 14:06:43 2023: CLI args: /usr/bin/falco -o json_output=true -V ./tmp_rules.yaml -c /__w/plugins/plugins/plugins/dummy_c/falco.yaml -o log_level=debug -o log_stderr=true -o log_syslog=false -o stdout_output.enabled=true
Mon Oct 30 14:06:43 2023: Falco initialized with configuration file: /__w/plugins/plugins/plugins/dummy_c/falco.yaml
Mon Oct 30 14:06:43 2023: Loading plugin 'dummy_c' from file /usr/share/falco/plugins/libdummy_c.so
Mon Oct 30 14:06:43 2023: Runtime error: cannot load plugin /usr/share/falco/plugins/libdummy_c.so: plugin required API version '2.0.0' not compatible with the framework's API version '3.0.0': major versions disagree. Exiting.

To fix this I bumped the dummy_c plugin to use the latest API provided by the c++ plugin SDK.

Which issue(s) this PR fixes:

Special notes for your reviewer:

[github-actions[bot]]

Rules files suggestions

[Andreagit97]

I will update the dummy plugin to the latest framework API version

[github-actions[bot]]

Rules files suggestions

Rules files suggestions

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Andreagit97, leogr

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/falcosecurity/plugins/blob/master/OWNERS)~~ [leogr] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[poiana]

LGTM label has been added.

Git tree hash: 287e1903907843e7fdd555ef66bd364962b70851